Summary of Significant Accounting Policies - Calculation of Basic and Diluted Income Per Common Share and Common Share Equivalents (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic net (loss) income per common share
Net (loss) income	$ (2,069)	$ 953	$ (326)	$ (692)	$ (494)	$ 3,744	$ (10)	$ 152	$ (2,134)	$ 3,390	$ 6,704
Less: Preferred stock dividends									(28)	(28)	(28)
Net (loss) income applicable to common stock									$ (2,162)	$ 3,362	$ 6,676
Basic weighted average number of common shares outstanding									10,774	10,992	11,259
Basic net (loss) income per common share	$ (0.19)	$ 0.09	$ (0.03)	$ (0.06)	$ (0.05)	$ 0.35	$ 0.00	$ 0.01	$ (0.20)	$ 0.31	$ 0.59
Diluted net (loss) income per common share
Net (loss) income applicable to common stock									$ (2,162)	$ 3,362	$ 6,676
Add: Preferred stock dividends									28	28	28
Less: Fair value of stock warrants for dilutive warrants										(379)	(794)
Net (loss) income applicable to dilutive common stock									$ (2,162)	$ 3,011	$ 5,910
Basic weighted average number of common shares outstanding									10,774	10,992	11,259
Effect of dilutive securities
Dilutive stock awards										15	14
Weighted average number of diluted shares outstanding adjustment										15	14
Diluted weighted average number of common shares outstanding									10,774	11,007	11,273
Diluted net (loss) income per common share	$ (0.19)	$ 0.09	$ (0.03)	$ (0.06)	$ (0.05)	$ 0.35	$ (0.01)	$ (0.01)	$ (0.20)	$ 0.27	$ 0.52